Add registry/indexes/domain-tree.yaml (domain-tree.v0.1) with the Coulomb
domain tree aligned to State Hub: 14 active domains and 14 topics, including
six infotech topics. Mark DOMAIN-WP-0002 finished.
- Review integration files; fill SCOPE where templated
- Document dev workflow in stack-and-commands.md
- Seed WP-0002 implementation workplan; mark bootstrap finished
- Hub sync via fix-consistency
